Today I found this nice tip from Michael Leonard explaining what is a PCB and some EDA design tips, guidelines and best practices. I suggest this reading for everybody who needs to know more about PCB design:

Then tested the hard-reset: VOLUME_DOWN + VOLUME_UP + POWER. I feel the vibration of phone starting but after plugin the USB cable nothing is recognized. Trying this hard-reset with USB cable plugged didn’t work. I removed the cable from computer and as fast as I could pluged it back after hard-reset and saw this using $ dmesg command:

Then I restarted the phone keep pressing VOLUME_UP to enter on CWM recovery mode.
In CWM menu I cleared data/cache (factory reset) and installed these files:

cm-10-20131224-FXP-nozomi.zip
gapps-jb-20121011-signed.zip

Update: I use rVoix calling recorder program and this is the configuration that worked for my Xperia S:
Android version: 4.1.2
Kernel version: 3.0.58-FXP+ (Sat Jan 19 23:15:35 EET 2013)
CyanogenMod version: 10-20130119-UNOFFICIAL-nozomi
Version Number:
cm_nozomi-userdebug 4.1.2 JZO54K eng.
root.20130119.230737 test-keys
This is rVoix version I’m using: rvoix_mod_kaefert_v2.apk !
A strange thing I noticed: rVoix doesn’t work the first time I run it, after restarting the Android the rvoix service starts but the icon doesn’t appear in the notification area and the audio format selected (MP3/AMR) is ignored and it always save only WAV files.